Docker-compose installation and application

installation

1. Why use docker-compose?

Docker Compose easy to use and efficient management of the container, which is used to define and run a multi-application tool container Docker

 

2, other pre-conditions need to:

yum install -y py-pip python-dev libffi-dev openssl-dev gcc libc-dev make

 

3, prior to this command if curl is not installed on your computer, you need to install:

yum install -y curl

 

4, installation Docker Compose (1.20.1 -> docker18.03.1-ce) can use the following command to automatically adapt to download version Compose, and add execute permissions to install script

sudo curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose

sudo chmod +x /usr/local/bin/docker-compose

 

5, see the installation was successful:

docker-compose -v

 

6, the command is executed in the Compose path where the docker-compose.yml automatically constructed using the mirror image and starting container

docker-compose up

docker-compose up -d // back up and running container

 

Engineering, service, container

• Docker Compose will manage the container is divided into three, namely project (project), service (service), container (container)
• All files (docker-compose.yml) under Docker Compose form a run directory project, a project comprises a plurality of services, each defined image container runs, parameters, dependent, a service may comprise a plurality of containers instances

 

Common docker-compose commands and configuration:

1, lists all running container

docker-compose ps

 

2, view the service log output

docker-compose logs

 

3, port: Print binding common port, the following command can output port eureka public service bound to port 8761

docker-compose port eureka 8761

 

4, to build or re-build service

docker-compose build

 

5, start the specified service already exists in the container

docker-compose start eureka

 

6, stop the service has been running container

docker-compose stop eureka

 

7, delete the specified container service

docker-compose rm eureka

 

8, constructed, starting container

docker-compose up

 

9, to stop the specified service by transmitting a signal SIGKILL container

docker-compose kill eureka

 

10, pull: Mirror download service

docker-compose pull xxxx

 

11, the service is provided to specify the number of containers luck, specified in the form of service num =

docker-compose scale user=3 movie=3

 

12, execute a command on a service

docker-compose run web bash

 

docker-compose.yml property

Specify docker-: version written in the file format compose.yml 
services: a plurality of collection containers 
build: build configuration, Compose will automatically use it to construct the mirrors, this value may be a path, an object may be used to specify the parameters Dockerfile 
command: override the default implementation of the container after the start command 
dns: dns server configuration, can be a value or a list 
dns_search: Configuring DNS search domain, can be a value or a list of 
environment: the environment variable configuration, you can use an array or a dictionary in two ways 
env_file : get environment variables from a file, you can specify a file path or path list, which is a lower priority than environment specified environment variable 
expose: expose the port, the port will only serve to expose the connection without exposure to the host 
image: specified service mirror used 
network_mode: set the network mode 
ports: port definition of external exposure, and expose the corresponding 
links: the specified vessel is connected to the current connection, can be an alias to avoid container ip embodiment results in restart dynamically changing not connection 
volumes: volume mount path 
logs: Chi output

Docker Compose Other

Updated container

• When configuring the service changes, you can use docker-compose up command to update the configuration

• At this point, Compose deletes the old container and create a new container, the new vessel will join the network to a different IP address, the name remains the same, pointing to the old content from any of the connection will be closed, re-find and connect up new container

• May be used between the service name of each service access, allowing links define an alias, the alias used to access other such services

version: '2'
services:
    web:
        build: .
        links:
            - "db:database"
    db:
        image: postgres

In this way you can use the Web service or database db db visit served as a hostname

 

docker-compose.yml Case:

# cat docker-compose.yml

version: '2'
services:
  db:
    image: mysql:5.7
    volumes:
      - "./.data/db:/var/lib/mysql"
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: wordpress
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
 
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    links:
      - db
    ports:
      - "8000:80"
    restart: always
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_PASSWORD: wordpress